<template>
	<view class="u-wrap">
		<view class="fl_al" style="padding: 0 32rpx;box-sizing: border-box;">
			<text class="type">{{type==0?'自提':'外卖'}}</text>
			<view class="kuang4">
				<u-search placeholder="请输入想喝的饮品" bgColor="#fbfbfb" v-model="keyword"></u-search>
			</view>
		</view>
		<view class="lunbo">
			<u-swiper :list="list1" @change="change" height="280rpx" @click="click"></u-swiper>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop"
				:scroll-into-view="itemId">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item"
					:class="[current == index ? 'u-tab-item-active' : '']" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.name}}</text>
				</view>
			</scroll-view>
			<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box"
				@scroll="rightScroll">
				<view class="page-view">
					<view class="class-item" :id="'item' + index" v-for="(item , index) in tabbar" :key="index">
						<view class="item-title">
							<text>{{item.name}}</text>
						</view>
						<view class="kuang3">
							<view class="fl_ju spson" v-for="(item1, index1) in item.productList" :key="index1">
								<view class="flleft fl_al">
									<image :src="item1.image" mode=""></image>
									<view class="xinxi">
										<view class="name">
											{{item1.productName}}
										</view>
										<view class="shu">
											{{item1.briefDescription}}
										</view>
										<view class="qian">
											¥{{item1.price/100}}
										</view>
									</view>
								</view>
								<view class="flright">
									<image src="../../static/add.png" @click="add(item1)" mode=""></image>
								</view>
							</view>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
		<view class="btns fl_ju">
			<image src="../../static/gouwo.png" @click="show = true" class="gouwo" mode=""></image>
			<view class="fl_al">
				<view class="jine">订单金额 <text class="qian2">￥118.00</text> </view>
				<u-button type="primary"
					:customStyle='{width:"200rpx",fontSize:"24rpx",borderRadius:"88rpx",margin:"0"}'
					text="去结算"></u-button>
			</view>

		</view>
		<u-popup :show="show" mode="bottom" @close="close" @open="open">
			<view class="phone">
				<view class="haoma fl_ju">
					<text>已选商品</text>
					<view class="del fl_al">
						<image src="../../static/ashbin.png" mode=""></image>删除
					</view>
				</view>
				<view class="fl_ju spson">
					<view class="flleft fl_ju">
						<view class=" fl_al">
							<image src="../../static/tx.png" mode=""></image>
							<view class="xinxi">
								<view class="name">
									土豆泥
								</view>
								<view class="shu">
									鲜柠配乌龙，柠檬新茶宠
								</view>
								<view class="qian">
									¥18.00
								</view>
							</view>
						</view>

						<view class="flright">
							<u-number-box v-model="value">
								<view slot="minus" class="minus">
									<u-icon name="minus" size="12"></u-icon>
								</view>
								<text slot="input" style="width: 50px;text-align: center;"
									class="input">{{value}}</text>
								<view slot="plus" class="plus">
									<u-icon name="plus" color="#FFFFFF" size="12"></u-icon>
								</view>
							</u-number-box>
						</view>
					</view>
				</view>
			</view>
		</u-popup>
	</view>
</template>
<script>
	import classifyData from '@/utils/classify.js';
	import {
		productList,
	} from '@/api/url.js'
	export default {
		data() {
			return {
				scrollTop: 0, //tab标题的滚动条位置
				oldScrollTop: 0,
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				itemId: '', // 栏目右边scroll-view用于滚动的id
				tabbar: [],
				menuItemPos: [],
				arr: [],
				scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
				timer: null, // 定时器
				value: 1,
				title: '更多操作',
				show: false,
				keyword: '本店爆款猪猪奶茶',
				list1: [
					'https://cdn.uviewui.com/uview/swiper/swiper1.png',
					'https://cdn.uviewui.com/uview/swiper/swiper2.png',
					'https://cdn.uviewui.com/uview/swiper/swiper3.png',
				],
				type: 0,
				params: {
					pageNum: 1,
					pageSize: 10,
				},
				chanping: [],
				token: uni.getStorageSync("token")
			}
		},
		onLoad(option) {
			this.list()
		},
		onReady() {
			this.getMenuItemTop()
		},
		methods: {
			add(e) {
				console.log(e)
				uni.navigateTo({
					url: '/pages/index/single?id='+e.id
				})
			},
			list() {
				productList().then(res => {
					// console.log(res)
					this.tabbar = res.data.data
				})
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if (this.arr.length == 0) {
					await this.getMenuItemTop();
				}
				if (index == this.current) return;
				this.scrollRightTop = this.oldScrollTop;
				this.$nextTick(function() {
					this.scrollRightTop = this.arr[index];
					this.current = index;
					this.leftMenuStatus(index);
				})
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
						resolve();
					}).exec();
				})
			},
			// 观测元素相交状态
			async observer() {
				this.tabbar.map((val, index) => {
					let observer = uni.createIntersectionObserver(this);
					// 检测右边scroll-view的id为itemxx的元素与right-box的相交状态
					// 如果跟.right-box底部相交，就动态设置左边栏目的活动状态
					observer.relativeTo('.right-box', {
						top: 0
					}).observe('#item' + index, res => {
						if (res.intersectionRatio > 0) {
							let id = res.id.substring(4);
							this.leftMenuStatus(id);
						}
					})
				})
			},
			// 设置左边菜单的滚动状态
			async leftMenuStatus(index) {
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
			},
			// 获取右边菜单每个item到顶部的距离
			getMenuItemTop() {
				new Promise(resolve => {
					let selectorQuery = uni.createSelectorQuery();
					selectorQuery.selectAll('.class-item').boundingClientRect((rects) => {
						// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
						if (!rects.length) {
							setTimeout(() => {
								this.getMenuItemTop();
							}, 10);
							return;
						}
						rects.forEach((rect) => {
							// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
							this.arr.push(rect.top - rects[0].top);
							resolve();
						})
					}).exec()
				})
			},
			// 右边菜单滚动
			async rightScroll(e) {
				this.oldScrollTop = e.detail.scrollTop;
				if (this.arr.length == 0) {
					await this.getMenuItemTop();
				}
				if (this.timer) return;
				if (!this.menuHeight) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
				}
				setTimeout(() => { // 节流
					this.timer = null;
					// scrollHeight为右边菜单垂直中点位置
					let scrollHeight = e.detail.scrollTop + this.menuHeight / 2;
					for (let i = 0; i < this.arr.length; i++) {
						let height1 = this.arr[i];
						let height2 = this.arr[i + 1];
						// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
						if (!height2 || scrollHeight >= height1 && scrollHeight < height2) {
							this.leftMenuStatus(i);
							return;
						}
					}
				}, 10)
			},
			change() {},
			close() {
				this.show = false
			},
			cplist() {
				orderProductList(this.params, this.token).then(res => {
					console.log(res)
					this.chanping = res.data.rows
				})
			},
		}
	}
</script>

<style scoped lang="scss">
	.spson {
		margin-top: 20rpx;
		padding: 20rpx;
		box-sizing: border-box;
		border-top: 1px solid #EBEBEB;
		box-shadow: 5px 5px 10px 1px #EBEBEB;
		border-radius: 20rpx;

		.flleft {
			.name {
				font-weight: 600;
				font-size: 30rpx;
			}

			.shu {
				font-size: 24rpx;
				color: #c5c5c5;
				margin: 10rpx 0;
				overflow: hidden;
				white-space: nowrap;
				text-overflow: ellipsis;
			}

			.qian {
				font-size: 20rpx;
			}

			image {
				width: 100rpx;
				height: 100rpx;
				margin-right: 20rpx;
			}
		}

		.flright {
			width: 40rpx;
			height: 40rpx;

			image {
				width: 100%;
				height: 100%;
			}
		}
	}

	.quxiao {
		font-weight: 400;
		font-size: 32rpx;
		color: #fff;
		margin-top: 32rpx;
		text-align: center;
	}

	.u-safe-bottom {
		display: none;
	}

	/deep/ .u-popup {
		flex: 0 !important;
	}

	.u-popup__content {
		background-color: #fff0 !important;
	}

	/deep/ .u-transition {
		bottom: 120rpx !important;
	}

	.phone {
		padding: 30rpx;
		box-sizing: border-box;
		background-color: #fff;
		text-align: center;
		border-top-right-radius: 32rpx;
		border-top-left-radius: 32rpx;

		.xinxi {
			text-align: left;
		}

		.title {
			font-weight: 400;
			font-size: 28rpx;
			color: #666666;
			margin-bottom: 42rpx;
		}

		.haoma {
			text {
				color: #090909;
				font-size: 26rpx;
				font-weight: 600;
			}

			.del {
				image {
					width: 30rpx;
					height: 30rpx;
					margin-right: 10rpx;
				}

				font-size: 24rpx;
				color: #AAAAAA;
			}
		}


	}

	.btns {
		position: fixed;
		bottom: 0;
		left: 0;
		right: 0;
		margin: auto;
		background-color: #fff;
		padding: 25rpx 30rpx;
		box-sizing: border-box;
		border-top: 1px solid #707070;

		.jine {
			color: #2C2C2C;
			font-size: 32rpx;

			.qian2 {
				color: #FF5B4C;
				font-weight: 600;
				margin: 0 15rpx;
			}
		}

		.gouwo {
			width: 50rpx;
			height: 50rpx;

			imagew {
				width: 100%;
				height: 100%;
			}
		}
	}

	.type {
		font-size: 32rpx;
	}

	.kuang4 {
		width: 582rpx;
		margin-left: 42rpx;
		padding: 17rpx 30rpx;
		box-sizing: border-box;
		border-radius: 50rpx;
		background-color: #FBFBFB;
		box-shadow: 5px 5px 10px 1px #EBEBEB;
	}

	.lunbo {
		margin: 32rpx 0;
	}

	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #005DFF;
		border-left: 10rpx solid #005DFF;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;

	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.class-item:last-child {
		min-height: 100vh;
	}

	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>